electrical circuits
Post on 21-Jan-2016
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Electrical Circuits
Circuits:
A circuit is made up of a power supply, connecting wires & various elements that allow current to leave a power source, travel through the elements & return back to the power source.
Common Electric Parts
Battery/Power Source
Bulb
Common symbols (cont’d)
Switch
Push-button Switch
Resistor
Voltmeter
Ammeter
V
A
Circuits
Power Supply
Resistor
A
Ammeter
v
Voltmeter
- +
Types of Circuits:
There are 2 types of circuits: 1. Series Circuit 2. Parallel Circuit
SERIES
Trick to help identify type of circuit:
Series: Current has only one option to flow
Parallel: Current has more than one option to flow through
PARALLEL
Series Circuits
Components are connected end to end
Current only follows one path If one part of the circuit is broken,
the entire circuit will stop functioning
Eg: Christmas tree lights
Parallel Circuits
Circuit that contains at least one branch
Current can follow at least 2 different paths
If part of the circuit is defective another part may still be able to operate.
Eg: headlights on a car
Series or Parallel?
AA
SERIES
SERIES
PARALLEL
PARALLEL1.
4.3.
2.
Adding an Ammeter into a Circuit
In order to measure the current traveling through a circuit, an ammeter must be inserted into the circuit.
An ammeter is always connected inside the circuit in series.
A
In each diagram, is the ammeter hooked up correctly to these circuits?
Connecting An Ammeter
A
A
A
A
A A
Adding a Voltmeter to a Circuit
In order to measure the voltage traveling through a circuit, a voltmeter must be inserted into the circuit.
A voltmeter is always connected outside the circuit in parallel.
V
In each diagram, is the voltmeter hooked up correctly to these circuits?
Connecting A Voltmeter
VV
V
V
V
V
KEY POINTS
Voltmeter – always placed outside of circuit attached in parallel
Ammeter – is always placed inside circuit attached in series
Setting up a Circuit
PARV acronym P-ower A-mmeter R-esistor V-olt Meter
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